Process of washing gases and vapors



Patented July 2, 193E I RD GUTENSOHN, F FRA'NORT-HOCHST-ON-THE-MAIN',GERMANY, .ASSIGNOR TO I. G. FARBENINDUSTRIE AKTIENGESELLSCHAFT, OFFBANKFORT-ON-THE-MAIN, GmMANY, A CORPORATION OF GERM r v EBOCESS 0FWASHING GASES AND VA?ORS no Drawing. Application filed June is, 1928,Serial no. 285,212, and in Germany June as, 1927.

The present invention relates to a new process for washing gases andvapors.

In many branches of industry where gases and vapors have to bepurified,the removal retained by the washing liquid, if there is added to thelatter a small percentage, for

instance 0.1-0.2 per cent of a wetting agent, such as used .in' thetextile industry. The quantitative proportion of the wetting agent to beused may vary, according to the par- 1 ticular conditions, between 0.05and 1.0 per cent of the washing liquid. For the purpose in questionthere may be used with advantage aromatic, hydro-aromatic or hi heraliphatic sulfonic acids .or salts ,thereo also mixed aromatic-aliphaticsulfonic acids, either alone or mixed with each other.

An organic solventmay be added, any of the usual solvents may besuitable .for the purpose, in particular such as are capable ofpreventingthe formation of froth, for instance tetrac quantity of thesolvent is advantageously adusted to the quantity of the wetting agentto be used, the preferred proportion varying between 5 dust partic esare immediately wetted and retained by the washing liquid when theytouch the surface of the liquid containing th wetting a cut. The ra 1dand complete removal of the impurities mm the gases by use of thewashing liquids containing a wetting agent of the kind referred toshortens the washing 0 eration and'allows of the same purifying e ectbein " simp er apparatus and a smaller quantity of In The followingexamples serve to illustrate lorethylene or the like. The

er cent and 100 per cent. The

obtained with a less extensive and my invention, but they are notintended to limit it thereto.

(1) In washing blast-furnace gases and,

in general, gases which have to be purified in metallurgical works andfoundries or in cok cries in the wet way, that is to say by water inwash-towers, trickling towers or the like,

there is added'to the washing liquid one to two grams per liter ofsodium benzylnaphthalene-sulfonate. A I I (2) In the purification ofroastinggas or flue gas, for instance S0 as it is practiced in organicchemicals works, there is added to the washing water in the wash towersone to two grains per liter of butylnaphthalene-sulfonic aci I (3) Inbriquetting works the air, absorbed by a ventilator and which contains agreat quant1ty of brown-coal flue-dust, is blown.

through a Raschi'g trickling-tower the trickling liquid for whichconsists of cold water to which there are added, per liter of theliquid, two to five grams of sodium isopropylnaphthalene-sulfonate and0.5 to 2.5 grams of perchlorethylene.

My new process offers particular advantages where the washing liquid isto be used repeatedly in acycle, because in such cases the smallestquantity of the wetting agent is,

solid im- 3.- In a. process for removing solid 'impuri ties from gasesand vapors by treating them with a washing liquid, the improvement whichcomprises addlng to the washing liquid butylnapthalen'e-sulfonic acid.

4.- In a processjfor reniovmg solid impurities from gases and vapors bytreating them with a washing liquid, the improvement which comprisesadding to the washing liquid one to two grams of butylnaphthal'ene-sulfonic acid per liter of the liquid. v

5. In a process for removing solid impurities from gases and vapors bytreating them with a washing liquid, the improvement which comprisesadding to the washing liquid a wetting agent in combination with anorganic solvent. 7

6. In a process for removing solid impurities from gases and vapors bytreating them with a washing liquid, the improvement which comprisesadding to the washing liquid a wetting agent in combination withtetra-chloro-ethylene.

7 In a process for removing solid impurities from gases and vapors bytreating them with a washing liquid, the improvement which comprisesadding to the washing liquid one to two grams ofbutylnaphthalene-sulfonic acid per liter of the liquid, andtetrachloro-ethylene in the proportion of 20 to 60% of the wettingagent.

In testimony whereof, I aifix my si nature.

- RICHARD GUTENS HN.

